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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b83a6f79eae78481f4c97a65750b27465a060dbc9974546ddf60b32023f16f' 
  AND token = 'CqELBN8l0bVtfDctV44P1xw0Lwd4VBzS7zUyhOB2C5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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