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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556f5eeede8a3f5be24870a056e78d629cba9afb67458388c7767d9cb2cb654b' 
  AND token = '/n0S5p0OCyKYSvBFvFoJ7lBJhT/eruE9J8OjXsyaBbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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