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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f36a3937c5ad8bd738a92d63bb81a65a4ab5059dc0f843ca6f06976c8fdf570' 
  AND token = 'P9qzKVEBPs7inSQ7PJnt3nVTokb6P8L0SqYznyQlagE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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