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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d80045a43d8274df567af0463ca5409851a5d553f863b7b931c9e7702c4fa47' 
  AND token = 'YUc0kOax6oUhSOWc50dP/FhVMm9cQmFcdCU9PBRiR5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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