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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a123c8029efdf187492a9b3757f1b9192da63021eea81196714f013df98c54' 
  AND token = '23GHLJrJ1bzawkjx3bioJ6gf8xQ8VaRJd6fQ4U0IcVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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