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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01de5010f97cda75f5a4fbc9b91c2e680c8029df0cbd8f8c2846bdafa6bcbacd' 
  AND token = 'qImWN3FiLw/ABG6ifqYvKEmSJDe//pVdo7tqid4E1wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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