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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba64df50c5f99a79b8a3db22fbc141ae4b19fde3dbd81daba90b6384690a238' 
  AND token = '5KRFL6cxlzpW0C9X4sIkzAhMIkdvBRcNJSGDRpgR/Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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