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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cfaadeef5dd6c3e0c47392fa2b96f05cf65e5dd34131c24fdd701ff5cff677' 
  AND token = '/Pkm9IRmlMm8YSa0DJp3lzh6S1iSnjp5M2dNOjg3TbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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