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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7672a6c44fd9af95df7f41851ece5a678ac5d608611f5b04798ce09161e18228' 
  AND token = '1diNxtdmVX7IzshjvxSDVsml0cjMktIr1STlyMCi+Ys=' 
  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"
    }
  }
}