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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b03f7c72cf71c9e58f1f757a44fa348d1eb72f00eeec69e44cf93066d2f460c' 
  AND token = 'I/8XsnKy1iWkB+SPZqxAqGGt0yDRUKETqmb7uEinECY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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