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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd83bc11c2f1da2b50edc77933cb43171ea02a4462c4c7c10763b5b3cfdb700' 
  AND token = '2z5vFB6y2gmEST7+Z7BSR/6/i8livSVRLD3cGuQS0KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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