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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64771d24e346104a902ad735d80a4de56d5b9360cb7d80a5fdd8cadad9b55ae0' 
  AND token = 'Ei5sceeEsxVpUQ6dFN6t727dfQ04TrSbuO6Islzfq0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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