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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277512f2b71fa8881411fe6712da6093ef63904de30fd0166a091237e68d6439' 
  AND token = 'hSPCU9eSpM3+T11Et+9HIG/WT/JhzTwq42J94fbZS1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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