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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24f208c301c7212a48a59432366d9178f83b27f8d590d1670e000ce8a2baa49' 
  AND token = 'ty0FKvUE7XqN5L+Z9+34spR6FisraoVoBzrNM7BCSog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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