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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34501af2b4244ac36517c94e1c73f152e8208d8aa945f88af04d40a92e0fe8c' 
  AND token = 'N/ahhBfVYtdTNv0PlAbRwyuiByiURBK1fa+lctQPi3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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