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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9f50ccbde24d33128fe837d47f0b044cd17629f555022a1b9e8c7d8135a951' 
  AND token = '1+AbEyT5Ul+fiqkXWnzF7OQw4NC6NFNTMEpOdayU3DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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