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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a2497ebdc73c7f10ac20463043e61d2370dc02e3d6b13f33bb0a71421f4432' 
  AND token = 'CfJ4FJ8awKJb+OUEfhvHFvCF+9K9/K7zOiG2sdfrRY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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