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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab4d87ae19899424f19b094a19ee744ff1fd263dc78bff8931fe6ed6773e74c' 
  AND token = 'iHIdR6+4yx/Ri+pXjOb0Vl+NRGsvHy7S5kFk+37m3xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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