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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707c980a3a86440468425e922406c1136aa11e70e2b7ca9ec9c965af5872c3e7' 
  AND token = 'yG6p3DU2gWeHR+vFZhjiVEJjaxANnvRZ6opKVb0FU84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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