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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76208b5515cb0925c6195beb90025ef6845b4cd1c26d60812f9047b684d235e' 
  AND token = '9dO797KDoVqrvDVClBINrfFL32nSIbZB+rSs0xABbhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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