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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216c489182668ead5d7d709467612269e2f405eead6540ca9fcdc4470437fb60' 
  AND token = 'OS7VmNqQGvDQHO7P0byCU/uh26r2bQ44O4HLdQg28oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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