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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83cee6328363d5e2a0fc6bab2b523458721e5d8c0da7c1e5878288eba66777d' 
  AND token = 'soeAlqinsBRoP9upmhrqPI0OUxzskyI6+zWsyln3vcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}