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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48389f10848937280117efde0758063afe0ae4afbab5d9194d33ff1ae8800f3' 
  AND token = 'fagpyeUXSfdM903Z0k8iZ0qZguRShpvWal4lKWmFZM4=' 
  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"
    }
  }
}