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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf198b799be2b70aeadb0df1752bacf6263e46b160f47fdc2b684bb9e745217' 
  AND token = '6Rx9bjVjQNn/YKtGAwU+5bjli8JXPX8IcsmR/XSvseI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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