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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea847c58b160d0b074b80eebb70d155438f6d4b619d47197c4dbead17b82c2f' 
  AND token = 'g/pwUCuypodVkCm+CM7JignmyXqiOYSAoUCx23As13Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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