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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e7ffd5391bf7c6a77b83d3730cd91e492846ad7755099db50bb66abf33b97f' 
  AND token = 'rdfcBEre8D4BExQMK2yZRYHxiJoJKFSUwrk0CPQpz0Y=' 
  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"
    }
  }
}