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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6310ffb513749abc1ae6ed61d7ed50ac025bd6af090ef05a9d63d4b5f6f8f1' 
  AND token = 'L6o9JvPriGZfdbOnMBLHHsV7v2U2HwkQvF8HOycdF40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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