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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef799577346cc211cb5a876f1eec025ba6435f855288a2a634581a9d878c07d1' 
  AND token = 'CEGw0s9TdVU7Ej8wnteKFK8CicLE2xQQpMYc/stZ4GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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