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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ed14881e9f7e5585d5449123c0990cb9de12fb7204b8ef61031be833ea19e9' 
  AND token = 'OMld3a0hGhiFn8Jl/suQcPOFk7C+6RFN4Y7wszPAS0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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