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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeef6460d8dc5628742f2f4de18acea2abb3ae8df7ef59770e37be4d98fc06c3' 
  AND token = 'J9xZRPzZ81osdlc7O6daxzM1C9655axCOVObpxfsoJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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