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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faad71b1fa3808f187bda048d915ad71f024670a6e88dbff78dbe024cdb03271' 
  AND token = 'jAegU1CabcSW/krW/j/OoyrjMT4x/Ln8ZQylFAshY7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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