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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3283fdc85256f36a0140ed2cfc815cda1d81927a035af9e8b669a46d3285d4ef' 
  AND token = 'Ji9AltP7Y7fNzJvX4fYmH2Oaf+a0ajdpmxsPh9mcOpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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