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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070d889569499199b9ef10697020110d4e9dcfcb9ba96a052d9509ff0da5dac1' 
  AND token = 'k83o4NHliJREIkfsCDrmcSQi0We0CtPpfx3se8eus5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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