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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9f8123bf9af0d0f0459b02be3db45ab582c315f2f3462e0a705414a6e7692e' 
  AND token = 'zyYdBTJPbVK53GYc7D7cogz9xgVJ8rhtO0MIbVd3kG4=' 
  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"
    }
  }
}