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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d9cdc3ea780dbeb332a5448ea8d908a2c14b74551b56f9f70596599380d4d1' 
  AND token = 'A8Pig7bIJqVy3zsKZ24doLTlbvFO4hTj1JLp6dhuRIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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