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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834034347c3e51c5a90f71bc59e57881a98e80181fab5b2970ca8c0630e2c466' 
  AND token = '3VG8DRNrJ7Do2+FPBdCFyc7m4pttlulbZImRcyyR4UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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