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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20191b802675b5590a06957957fc9ab1b1b66f50872391cc1843d9774a49b26' 
  AND token = '9cm1FON1iztu1EbHSuQ3GXrkXxQPgg2RB8DHNu5e+0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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