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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b15ac174c6751f8a24a5d4af054d0b4620f05476c2eee8673e205a9bfddec0' 
  AND token = 'Be7OgCX4y7hklAvCkn++A9W+Wfcj4pynSeMCwOijGro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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