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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7639a7d76f6f81363985954f710f2d30c0f9666f5f1fac9ca253d5584ea04562' 
  AND token = 'M6hvc9pIrkMY7f0UNU2aVgSpW8jY5pOWUNhtzR6AZus=' 
  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"
    }
  }
}