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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df44e3eb803857a9a4e6e3be786ff7f816c3ffe10ddb2e6febf23768ea219426' 
  AND token = 'ay0i/Hz0l/HbovjB6B/myZlqNiN7hnxzu3U894osU6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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