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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eed529a3aa0d4df5099dbbf856f83f164572efc35b01dd0c2ce6d7061c2f1ec' 
  AND token = '9oydKvnr7ztSNGYoZRXoEDSGGOfJQcdzlicNXLo8yfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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