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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379ec705025c40cb64799f6b72d38f0f323cd1759cf10ba813b57be34119d0fd' 
  AND token = 'tw7DZL/PKZgG6o2pABOhmbeWFihhw486FiF+ePOihOE=' 
  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"
    }
  }
}