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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8c7ef6ef9f7d853f94f90a3774b435903438ef1e56a1d0900933d1252159c6' 
  AND token = 'bI5dRCR+csV5Mw9RwtgknsoGszMVatjO441iIeQFpPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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