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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e365a53018ac4a8a95e23ec3732660146ec29c9b1e1af34253399426a6d791af' 
  AND token = 'uVXzou+lH0qc2A9azwA4E8hHYSdIwn7Wghg8iQc11XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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