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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4faf714ec1b809f1703cf9c8017219b3c1001f4f90d7ba384159e8c64e1c8c' 
  AND token = 'nejzXoid2HOW0VF3BJc1ELeXqxUGkrX4wj1LO8jF9og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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