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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0dab542ba6803eb3a3893cb31c9c5c8ee04cb4b616e571e5c89134cd4b56d45' 
  AND token = 'dHMQUalGj5JH8ueZIJxKARBBs1FGAPShSGAoc/nDlzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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