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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e6377283558e5b14cdb73a0abd0f4258038625924213b681e60386a36c5961' 
  AND token = 'ucIHJYisVP73A9+o8ziEr5i91tqqQzL2GgCmBq+q6Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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