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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ee653966ccba9ad6f716c6deb150f0699d7f7413d52ddbdf74704778a90b9c' 
  AND token = '++/9QMU7k2eMa4Yg8My0nx8xTEGPCus3lcQfXU7lkWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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