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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd16657ddcd856906b401e7405fafd5361455b690766eedb01ca7299a0ebf50' 
  AND token = 'g80qazc4L7emXNnmzHY18B1uKBnirdJhv/q6e82v9X0=' 
  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"
    }
  }
}